Method of making plaster-board.



' J. W. VOGLESONG.

METHOD OF MAKING PLASTEB. BOARD.

APPLICATION FILED JULY 13,1908.

Patented Aug. 1, 1911.

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I. W. VOGLESONG.

METHOD or MAKING. PLASTER BOARD.

APPLIOATIQN F'ILED' JULY 13,1908. 999 474 Patented Aug. 1,

s'raan User i JOHN W. VOG'LESONG, OF ELYRIA, OHIO, ASSIGNOR T0 PITTSBURGH PLATE GLASS COMPANY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION OF PENIISYLVANIA.

METHOD OF MAKING PLASTER-BOARD.

Specification of Letters Patent.

Patented Aug. 1, ram.

Application filed July 13, 1908. Serial No. 443,203. I

To all whom it may concern:

Be it known that I, JOHN W. VOGLESONG, a citizen of the United States, residing at Elyria, Ohio, have invented certain new and useful Improvements in Methods of Making Plaster-Board, of which the following is a specification.

This invention has reference to an improved method of making plaster board formed primarily of a mixture of plaster of Paris or stucco, and water, to which in some cases it is desirable to add a relatively small quantity of cement, and in conjunction with which mixture some kind of binding material such as wood fiber or Wood fiber mixed with paper cuttings is generally employed.v

The first of the objects of my invention is the provision of an improved method or process of making plaster board or plaster structures of various shapes, such for example as fire-proofing or partition blocks which will secure a high degree of compactness of the material employed, a uniform distribution of the substances entering into the formation of the product, and which can be operated with great facility, and also such rapidity as insures economical production.

A further object of this invention is the provision of a method of the character speci fied which can be operated continuously with a given set of mechanical devices, without sochoking up the passages ofthe forms employed as to require the expenditure of considerable time and trouble, to have them sufliciently freed of the material to be used over again. V

The above, as well as such other objects as may hereinafter appear, I attain in the present practice of my invention in connection with the utilization of a certain form of chamber in lowered position ready for the removal of one of the boards after it has been formed;

Figure 2 indicates partly in section, the arrangement of the interior of such pressure a board that has been made in accordance with my invention, with fabric or cloth which I employ partially stripped off at one corner.

Referring now more particularly to Figure 2, it will be seen that I have therein indicated a pressure chamber 1 arranged with a supply opening 2 above the same adapted to be closed by a valve or similar contrivance 3 constructed to bear outwardly against the inner upper face of the chamber as shown,

and supported upon a pivoted lever 4 in a manner so that it may be held normally closed by means of the cord 5, either by counterweight 6 or other convenient. means, while above the opening 2 I arrange a hopper 7 designed to first receive the material which is to be utilized in the formation of the board or other product.

The lower end of the pressure chamber 1 is open, but is arranged to be closed by means of a movable bottom part or chase 8 constructed to be raised and lowered by some suitable mechanism such for example as the toggle levers 9 indicated in Figure 1 which may be actuated from a piston rod 10 operated by fiuid pressure or any other suitable means. The board or chase 8 is constructed in a kind of grating with a drainage or outlet pipe 11 to take off the liquiu or water used after it has been pressed through the form, and upon the upper surface 12 of the chase 8 or the bars of the same, is arranged preferably a bronze grating 13 shown more in detail in Figure 3, which has cross bars 13 and smaller cross bars 13*, as well as a plurality of small points or supports 14 formed on the bridges that connect the cross bars 13* and 13 by means whereof I support a strong wire gauze or closely woven 'wire netting 15 which in the formation of a plaster board by my improved process has upon its upper surface a sheetor layerofmuslin or similar cloth or fibrous material marked 16. 4

As a convenient means for introducing device such as indicated at 18, and extended ing the upper portions of the mass a com-' pactness which would be lacking if the air pressure were applied directly to the mixture.

In making a board approximately 32x36 inches and 3 inch in thickness, I use about five gallons of fiber-carrying liquid and one gallon of liquid which carries the plaster of Paris and a small percentage of cement,

-the proportions being about one part of cement to tenparts of plaster of Paris, and to the i said six gallons of material which is dumped from the hopper into the pressure chamber I add approximately through the three water inlets shown-some eight gallons more or less of water,'making a total charge of about fourteen gallons. These proportions may of course be somewhat varied without departing from the spirit of my invention.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent, is the following 1. The herein described method of making plaster board and the like, which consists in putting a mixture of plaster of Paris and water in a pressure chamber, admitting additional water to said mixture in said chamber before the solids of the mixture have settled, and then cutting off the admission ofwater and then increasing the air pressure in the chamber above the fluid to deposit the solid matter upon the former and press the water out therethrough.

2. The method of forming plaster board and the like, which consists in placing a mixture of plaster of Pa is and water upon the former of a pressure chamber, admitting an additional quantity of water into said chamber before the solids of the mixture have settled, and then admitting air or like fluid. under pressure to the chamber, first comparatively slowly and then with increased rapidity until the'desired pressure is secured.

3. The method of forming plaster board and the like, which consists inpl'acing a mixture of plaster of Paris, fibrous material and water upon the former of a pressure chamber, admittin an additional quantity of water into said chamber before the solids-of the mixture have settled, and then increasing the air pressure in the chamber above the fluid to deposit the solid matter upon the former and press the water out therethrough.

4. The method of forming plaster board and the like, which consists in placing a mixture of plaster of Paris, cement, and

water upon the former of a pressure-chamber, admitting an additional quantity of water into said chamber before the solids of the mixture have settled, and then admitting air or like fluid under pressure to the chamber to deposit the solid matter upon the former and press the water out therethrough. 5. The method .of forming plaster board and the like which consists in maintaining water containing fibrous material in agitation, adding plaster of Paris thereto, introducing the mixture upon the former of a pressure chamber, admitting a quantity of water to the chamber before the solids of the mixture have settled and then applying air or like pressure to the chamber to force the water out through the former.

6. The method of making plaster board and the like, which consists in placing a mixture of plaster of Paris and water upon the former at the bottom of a pressure chamber, admitting a quantity of water upwardly into said chamber, under a low head, and

then admitting air or like fluid under pressure to the chamber to deposit the solid matter on the former and press the water out therethrough.

7. The method of making plaster board and the like, which consists in placing a mixture of plaster of Paris and water upon a previously admitted layer of water resting on the former at the bottom of apressure chamber, and then admittingair or like fluid under pressure to the chamber to deposit the solid matter on the former and press the water out therethrough. V

8. The herein described method of making plaster boards and the like, which consists in continuously admitting a supply of water to a pressure chamber provided with a former 'at its bottom, while a mixture of plaster Paris and water is being dumped on the former, and after such mixture has been dumped cutting off the supply of water and admitting air or like fluid under pressure to the chamber to deposit the solid matter upon the former and to press the water out through the former.

In testimony whereof I have hereunder signed my name in the presence of the two subscribed witnesses. 

